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MathGroup Archive 2002

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Re: To plot solutions, FindRoot as a function

  • To: mathgroup at smc.vnet.net
  • Subject: [mg37352] Re: To plot solutions, FindRoot as a function
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Fri, 25 Oct 2002 02:46:31 -0400 (EDT)
  • Organization: Universitaet Leipzig
  • References: <ap861r$53e$1@smc.vnet.net>
  • Reply-to: kuska at informatik.uni-leipzig.de
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

*What* can youe do ? Read the manual carefull ?

sol[a_?NumericQ, b_?NumericQ] := 
  x /. FindRoot[a*Tanh[b*x] == x, {x, {0.01, 0.1}}]
Plot3D[sol[a, b], {a, 1, 2}, {b, 1, 2}]

Regards
  Jens

Veniamin Abalmassov wrote:
> 
> Hello,
> 
> I'd like to plot the solution of an equation which depends on two
> parameters, e.g.
> 
> a*Tanh[b*x] == x
> 
> So, I'd like to see it in 3D, one axis is "a", other is "b", and the last
> is "solution".
> 
> I've tried naively to do it as follows:
> 
> sol[a_,b_]:=FindRoot[a*Tanh[b*x] == x, {x, {0.01, 0.1}}]
> Plot[sol[a,b], {a, 1, 2}, {b, 1, 2}]
> 
> And it doesn't work. Help me, please. What can I do?
> 
> Thanks a lot,
> 
> Veniamin


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